Kubernetes Container Orchestration Scheduling and Scaling 2

Question 1

Which field in a Pod spec prevents the scheduler from placing it on any node until explicitly set to false?

Accepted Answer

spec.schedulingGates

Answer

schedulingGates block a Pod from being scheduled until all gates are removed, allowing external controllers to control scheduling timing.

Question 2

A HorizontalPodAutoscaler targets 60% CPU utilization. Current usage is 90% across 4 replicas. How many replicas will HPA scale to?

Accepted Answer

6

Answer

HPA formula: ceil(4 * (90/60)) = ceil(6.0) = 6 replicas.

Question 3

What does the `podAntiAffinity` rule with `requiredDuringSchedulingIgnoredDuringExecution` guarantee?

Accepted Answer

Pods are never scheduled on nodes where matching pods already run

Answer

requiredDuringSchedulingIgnoredDuringExecution is a hard constraint enforced at scheduling time but not re-evaluated after placement.

Question 4

Which Kubernetes resource lets you limit the total number of pods from a deployment that can be simultaneously unavailable during a voluntary disruption?

Accepted Answer

PodDisruptionBudget

Answer

A PodDisruptionBudget (PDB) defines minAvailable or maxUnavailable to limit disruptions during voluntary actions like node drains.

Question 5

When using Vertical Pod Autoscaler (VPA) in 'Off' mode, what happens?

Accepted Answer

VPA only provides recommendations without applying them

Answer

In 'Off' mode, VPA computes and stores resource recommendations in its status but never modifies or restarts pods.

Kubernetes Container Orchestration Practice Test

Kubernetes Container Orchestration Practice Test

Kubernetes Container Orchestration Scheduling and Scaling 2